Wildfly: detailed explanation of technical principles of the server framework

Wildfly (formerly known as JBoss Application Server) is a Java -based open source application server.It is a JBoss Community project that supports Java Ee (Enterprise Edition) specifications.Wildfly provides a powerful and flexible server framework to build and deploy enterprise -level Java applications. The technical principles of Wildfly mainly include the following aspects: 1. Modular architecture: Wildfly uses modular architecture to manage and organize the server's functional modules.Each module is an independent jar file, which achieves functional combinations through the dependency relationship between modules.This modular architecture makes the server more flexible and can load and upgrade the module on demand. 2. Transaction Management: Wildfly provides a powerful transaction management function that supports distributed transactions and container management affairs.It uses Java Transaction API (JTA) to implement distributed transactions and provides container management transactions (such as JPA and EJB transactions). 3. Security: Wildfly provides comprehensive security support, including certification, authorization and encryption.It supports various identity authentication mechanisms, such as login based on user name/password, login -based login, and single login (SSO).In addition, Wildfly also supports role and permissions management to control users' access to resources. 4. Web service: Wildfly supports web services in the Java EE specification, including Servlet, JSP, WebSocket, and RESTFUL Web services.It also provides a lightweight HTTP server for handling HTTP requests and responses. 5. High availability and load balancing: Wildfly supports high availability and load balancing, which can realize application deployment in the cluster environment.It uses the Java memory architecture (Jgroups) to achieve cluster communication and data synchronization, and provides a variety of load balancing algorithms, such as rotation, weights and hash. Below is a simple Java code example using Wildfly to create a simple service: import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; @WebServlet("/hello") public class HelloServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException { PrintWriter out = response.getWriter(); out.println("Hello, World!"); } } Through the above code, we created a Servlet called "Helloservlet" and used @WebServlet annotations to map it to the "/Hello" path.When the path is accessed by the browser, Servlet will return the response of "Hello, World!". To sum up, Wildfly is a powerful and flexible server framework. Its technical principles include modular architecture, transaction management, security, web services, high availability and load balancing.Through the above characteristics and sample code, we can better understand and use the Wildfly server framework.